Very good method you describe for making the paper gun barrels.
I will experiment with your technique of wrapping paper around metal wire. Then, the wire can be withdrawn, and what is left is a perfect gun barrel?
I use a similar technique for "tapered" gun barrels. Instead of a piece of wire, I sanded a wood dowel to the interior diameter of the gun barrel, and wrapped the paper around it.
Then the wood dowel is withdrawn, leaving a paper gun barrel. This technique is more difficult than creating a "non-tapered" gun barrel, but it works well enough.
Mike
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